package com.hmdp.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hmdp.config.CacheClient;
import com.hmdp.dto.Result;
import com.hmdp.entity.RedisData;
import com.hmdp.entity.Shop;
import com.hmdp.mapper.ShopMapper;
import com.hmdp.service.IShopService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.SystemConstants;
import org.springframework.data.geo.Distance;
import org.springframework.data.geo.GeoResult;
import org.springframework.data.geo.GeoResults;
import org.springframework.data.redis.connection.RedisGeoCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.domain.geo.GeoReference;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.*;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private CacheClient cacheClient;

    public boolean tryLock(String key) {
        Boolean flag = stringRedisTemplate.opsForValue().setIfAbsent(key, "1", 10, TimeUnit.SECONDS);
        return BooleanUtil.isTrue(flag);
    }

    public void unlock(String key) {
        stringRedisTemplate.delete(key);
    }

    public Result querybyid(Long id) {
//        String key = CACHE_SHOP_KEY + id;
//        String shopJSon = stringRedisTemplate.opsForValue().get(key);
//        System.out.println(shopJSon);
//        if (StrUtil.isNotBlank(shopJSon)) {
//            Shop shop = JSONUtil.toBean(shopJSon, Shop.class);
//            return shop;
//        }
//        if (shopJSon != null) {
//            return null;
//        }
//        //获取互斥锁
//        String lockKey = "lock:shop:" + id;
//        Shop shop = null;
//        try {
//            boolean isLock = tryLock(lockKey);
//            //判断是否获取成功
//            if (!isLock) {
//                //失败休眠重试
//                Thread.sleep(50);
//                return querybyid(id);
//            }
//            shop = getById(id);
//            if (shop == null) {
//                //空值写入redis
//                stringRedisTemplate.opsForValue().set(key, "", CACHE_NULL_TTL, TimeUnit.MINUTES);
//                return null;
//            }
//            stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shop), 30L, TimeUnit.MINUTES);
//
//        } catch (InterruptedException e) {
//            e.printStackTrace();
//        }finally {
//            unlock(lockKey);
//        }
//
//      return shop;
Shop shop=cacheClient.queryWithPassThrough(CACHE_SHOP_KEY,id,Shop.class,this::getById,CACHE_SHOP_TTL,TimeUnit.MINUTES);
        System.out.println(shop+"shop");
if(shop == null){
    return Result.fail("店铺不存在");
}
return Result.ok(shop);
    }
    public void saveShop2Redis(Long id,Long expireSeconds){
        Shop shop=getById(id);
        RedisData redisData=new RedisData();
        redisData.setData(shop);
        redisData.setExpireTime(LocalDateTime.now().plusSeconds(expireSeconds));
        stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY+id,JSONUtil.toJsonStr(redisData));
    }
    public Result queryShopByType(Integer typeId, Integer current, Double x, Double y){
        if(x == null || y==null){
            Page<Shop> page=query().eq("type_id",typeId)
                    .page(new Page<>(current, SystemConstants.DEFAULT_PAGE_SIZE));
            return Result.ok(page.getRecords());
        }
        int from=(current-1)*SystemConstants.DEFAULT_PAGE_SIZE;
        int end=current*SystemConstants.DEFAULT_PAGE_SIZE;
        String key=SHOP_GEO_KEY+typeId;
        GeoResults<RedisGeoCommands.GeoLocation<String>> results=stringRedisTemplate.opsForGeo().search(key, GeoReference.fromCoordinate(x,y),new Distance(5000), RedisGeoCommands.GeoSearchCommandArgs.newGeoSearchArgs().includeDistance().limit(end));
        if(results == null){
            return Result.ok(Collections.emptyList());
        }
        List<GeoResult<RedisGeoCommands.GeoLocation<String>>> list=results.getContent();
        if(list.size()<=from){
            return Result.ok(Collections.emptyList());
        }
        List<Long> ids=new ArrayList<>(list.size());
        Map<String,Distance> distanceMap=new HashMap<>(list.size());
        list.stream().skip(from).forEach(result->{
            String shopIdStr=result.getContent().getName();
            ids.add(Long.valueOf(shopIdStr));
            Distance distance=result.getDistance();
            distanceMap.put(shopIdStr,distance);
        });
        String idStr=StrUtil.join(",",ids);
        List<Shop> shops=query().in("id",ids).last("ORDER BY FIELD(id," + idStr + ")").list();
        for (Shop shop:shops){
            shop.setDistance(distanceMap.get(shop.getId().toString()).getValue());

        }
        return Result.ok(shops);

    }
}
